error while compressing buildstream/buildstream image

I'm getting below error while compressing buildstream/buildstream image,. Can someone tell me if I'm missing something here.

$ docker-slim build --http-probe buildstream/buildstream
docker-slim[build]: info=http.probe message='using default probe'
docker-slim[build]: state=started
docker-slim[build]: info=params target=buildstream/buildstream continue.mode=enter
docker-slim[build]: state=image.inspection.start
time="2019-10-11T11:11:05+05:30" level=fatal msg="docker-slim: failure" error="remove /home/user/.asdf/installs/docker-slim/1.25.3/bin/.docker-slim-state/images/9678d0392a820ceed97f8d4e2914234b610ef539949d15d8e7226d8bb7a5ebe1/artifacts/files/etc/ld.so.cache: permission denied" stack="goroutine 1 [running]:
runtime/debug.Stack(0xc00051a1e0, 0x0, 0xc0003cc000)
	/usr/local/Cellar/go/1.11.1/libexec/src/runtime/debug/stack.go:24 +0xa7
github.com/docker-slim/docker-slim/pkg/util/errutil.FailOn(0x98b540, 0xc0005025a0)
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/pkg/util/errutil/errutil.go:14 +0x51
github.com/docker-slim/docker-slim/pkg/util/fsutil.PrepareImageStateDirs(0xc000442080, 0x30, 0xc0001ec007, 0x40, 0x0, 0x0, 0x0, 0x0, 0x20, 0x904fc4)
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/pkg/util/fsutil/fsutil.go:564 +0x6eb
github.com/docker-slim/docker-slim/internal/app/master/commands.OnBuild(0x86d701, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc00007db30, 0x0, 0x0, 0x7ffe907c1417, ...)
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/internal/app/master/commands/build.go:156 +0x8c2
github.com/docker-slim/docker-slim/internal/app/master.init.0.func6(0xc0000e0b40, 0x0, 0xc0000e0b40)
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/internal/app/master/cli.go:682 +0x1310
github.com/docker-slim/docker-slim/vendor/github.com/codegangsta/cli.HandleAction(0x85c9c0, 0x920a38, 0xc0000e0b40, 0xc000072700, 0x0)
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/vendor/github.com/codegangsta/cli/app.go:485 +0xc8
github.com/docker-slim/docker-slim/vendor/github.com/codegangsta/cli.Command.Run(0x900af0, 0x5, 0x0, 0x0, 0xc000069750, 0x1, 0x1, 0x919408, 0x3e, 0x0, ...)
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/vendor/github.com/codegangsta/cli/command.go:207 +0x991
github.com/docker-slim/docker-slim/vendor/github.com/codegangsta/cli.(*App).Run(0xc000096b60, 0xc00001c0c0, 0x4, 0x4, 0x0, 0x0)
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/vendor/github.com/codegangsta/cli/app.go:250 +0x6ea
github.com/docker-slim/docker-slim/internal/app/master.runCli()
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/internal/app/master/cli.go:1027 +0x55
github.com/docker-slim/docker-slim/internal/app/master.Run()
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/internal/app/master/app.go:6 +0x25
main.main()
	/Users/q/docker-slim/docker-slim/_gopath/src/github.com/docker-slim/docker-slim/cmd/docker-slim/main.go:8 +0x20
" version="linux|Transformer|1.25.3|b5aef546a575de242b2c3ace97e1fc11f028b137|2019-08-04_04:31:18PM" 

Reproduce the command with docker-slim build --http-probe buildstream/buildstream, then inspect pkg/util/fsutil/fsutil.go at PrepareImageStateDirs and internal/app/master/commands/build.go at OnBuild. Trace why removing etc/ld.so.cache fails with permission denied, and consider the compression successful when the reported image completes without that failure.